Carbon pack



J. S. FLEMING CARBON PACK Dec. 5, 1933.

Original Filed Oct. 17, 1928 A TTORNEYS.

Patented Dec. 5, 1933 UNITED STATES PATENT OFFICE CARBQN PACK Application October 17, 1928, Serial No. 313,000 Renewed September 30, 1931 12 Claims.

This invention relates to a duplicating pack capable of use in numerous different associations, but primarily intended to be employed in connection with, for example, a typewriter of more or less standard construction and by means of which various types of work may be expeditiously performed which have heretofore been incapable of accomplishment on a standard machine.

It is an object of the invention to furnish a device of this character the parts of which may be simply and economically constructed and assembled and which, in use, will render eflicient service over long periods of time with freedom from any difficulty.

A further object of the invention is that of providing a device of this type which may be applied readily to an inscribing machine such as a typewriter and will remain instantly available to the operator, aside from the fact that 20 the proper relative position of the several parts of the pack will be maintained.

With these and further objects in mind reference is had to the attached sheet of drawing illustrating one practical embodiment of the invention and in which:

Figure l is a perspective view of a portion of a typewriter showing a plurality of record strips in association with the platen thereof and also illustrating the pack in use;

Fig. 2 is a somewhat diagrammatic edge view of the duplicating pack;

Fig. 3 is an enlarged face'view thereof, certain of the parts being torn away to disclose the underlying construction; and

Fig. 4 is a perspective view of one form of restraining member which may be utilized advantageously in connection with a pack of this nature.

- In these several views the numeral 5 indicates a typewriter platen which may be supported in the usual manner upon a carriage (not shown) and which serves to feed and maintain in proper position a plurality of sheets to be inscribed, these sheets being in the present instance record strips 6 having upon their face suitable indicia. These strips are maintained in position in, for example, the usual manner, by a series of rollers 7 and at this time it will be noted that a supporting bar 8 is positioned adjacent the face of the platen and preferably above the same and carries a restraining member in the nature of a resilient, metal strip 9.

Upon reference to Fig. 1, showing the duplicating pack in operative condition with reference to the record strips 6, it will be observed that the leaves of the pack are interleaved in transfer manifolding relation with the record strips being aligned with the writing areas or blank forms of said strips during the writing operation. It will be understood that the record strips are moved or fed forwardly around the platen 5, this forward movement being that occasioned by clockwise rotation of the platen as viewed in Fig. 1; in other words, the upwardly extending ends of the record strips shown in this 05 figure move upwardly during the forward feeding movement. The duplicating pack also moves forwardly with .the forwardly feeding record strips. The duplicating pack includes a plurality of sheets or leaves, certain or preferably all of which bear transfer material at one or both faces thereof for the purpose of transfer inscription. In the embodiment shown, this car bon or transfer material is presented at but one surface of each of the sheets. These sheets are provided with lateral extensions 10 preferably integral with the sheets as shown and arranged in superposed relation at opposite edges of the pack toward the rear end thereof. These extensions are joined together in any convenient manner preferably by flexible stitching 11. While the pack may include any desired number of transfer sheets to accommodate the particular ,work in hand, five such sheets are disclosed in this embodiment. Four of these transfer sheets are indicated at 13 while the fifth sheet 12 is disposed inwardly of the pack from the others and is folded upon itself at or near the rear or trailing end of the pack to provide a checking construction in the form of a loop for cooperation with the restraining member or checking blade 9. It will be seen in Figs. 1 and 3 that the attaching stitching 11 does not extend continuously through the attaching extensions 10 of all of the leaves of the assembly, but leaves the two adja- 96,

cent plies of the folded or double leaf .12 free from each other throughout the length thereof,

the juncture or attachment therebetween being effected by means of the fold. This arrangement permits the checking blade 9 to pass relatively to the pack without obstruction between the two adjacent leaves 12. The pack may be cut away or rounded at the corners of its rear or trailing end, as shown in Fig. 3, to avoid obstruction in passage by the platen. At the leading or forward end of the pack, that is, the end opposite to the checking loop, the transfer leaves,

as shown, are preferably free from attachment with each other. Since the double leaf 12 is utilized for checking the forward movement of 1 10 the assembly, it may be referred to as a checking or anchoring sheet. The transfer sheets 13 are positioned at both sides of the checking sheet 12 and of the checking formation or loop thereof, having their rear or trailing edges preferably disposed successively in advance of one another and all in advance of the checking loop. These trailing edges are preferably folded at 14 to provide marginal reinforcement and to permit easy threading of the record strips into the spaces or passageways provided at this end of the pack.

These reinforcing folds preferably extend toward the central sheet of the pack.

Thus, if the record strips are threaded between the trailing edges of the duplicating or transfer leaves and the central leaf has its loop portion enclosing the restraining member 9, it will be obvious that if the platen is revolved to feed the strips they will move freely between the duplicating leaves to a point at which their free ends may be severed, if desired. By simply reversing the movement of the platen, however, the entire duplicating pack will be drawn down to a position adjacent the inscribing station of the machine, so that it will perform the function for which it is intended.

At this time it will be observed that by preferably having one of the inner faces of the central leaf present a duplicating or transfer surface, it is entirely feasible for an operator to insert between the sections of this leaf a separate record sheet independent of the record strips 6, and sheets of this nature will be available for removal and insertion as the platen is shifted. Also, while in certain instances, according to the present invention, it is preferred to have the folded checking sheet 12 positioned at the center of the pack with an equal number of transfer sheets 13 at each of the opposite sides thereof, it is obvious that the checking sheet need not be at the exact center in order to secure the advantageous function of balancing the transfer sheets 13 against one another. With the transfer sheets positioned at the opposite faces of the checking loop of the folded checking sheet 12, it will be observed that the transfer sheets at one side of the checking loop are balanced against Y those at the other side thereof. Therefore, in

the manipulation of the duplicating pack into different positions relatively to the record strips and forwardly and backwardly of the platen, the pull exerted upon the pack by cooperation of the checking blade 9 will tend to be equalized and in consequence the tendency of the folded checking or anchoring leaf 12 to be pulled or unrolled at its checking loop around the checking blade will be greatly reduced. In cases where there are the same'number of transfer sheets 13 at each side of the folded checking sheets as herein disclosed, the balancing of the sheets against each other will be complete and the stresses operating at each side of the checking loop will be fully equalized. In this manner the transfer sheets of the pack are effectually maintained in their correct transfer relation and displacements thereof which might interfere with the correct transfer of the inscriptions are avoided. Even where the balancing is not complete, as when the transfer sheets at opposite sides of the checking loop are different in number, yet the transfer sheet at one side are balanced against those at the other. There is a consequent tendency to balance the longitudinal stresses.

From the foregoing it will be understood that, amon others. the objects specifically aforementioned are accomplished by a pack of,- for example, the nature illustrated and described. It will be appreciated, however, that while in certain respects it is desirable to have the sheet centrally disposed with respect to the pack to provide a base leaf or sheet for cooperation with the restraining member, this need not necessarily be the case and, furthermore, it is not essential that a single integral sheet be employed in this connection, and also all portions of this sheet need not be coatedwith transfer material. These and other modifications of structure will suggest themselves to those skilled in the art as being well within the spirit of the invention as defined by the claims.

Having described my invention what I claim as new and desire to secure by Letters Patent is:---

1. As an article of manufacture a duplicating pack comprising a plurality of conn cted superposed leaves presenting transfer material, one of the innermost leaves being substantially centrally folded upon itself to provide a loop portion for the accommodation of a member to restrain movement of said pack. I

2.- As an article of manufacture a duplicating pack comprising a plurality of connected superposed leaves presenting transfer material, one of the innermost leaves being folded upon itself to provide a loop portion for the accommodation of a member to restrain movement of said pack and said loop portion being positioned in a plane intermediate transfer leaves and furnishing an edge extending to the rearward of the corresponding edges of the other leaves of said pack.

3. As an article of manufacture a duplicating pack comprising a plurality of superposed, connected carbonized leaves, the central leaf of said pack being folded upon itself to provide a loop portion for the accommodation of a member restraining movement of said pack.

. 4. A duplicating pack comprising a plurality of leaves presenting transfer material, said leaves being arranged in two groups connected through a central leaf folded upon itself, the end edges of the leaves of each group being free from an adjacent leaf to provide spaces for the accommodation and passage of record strips, and the inner face of said central leaf'presenting transfer material to be disposed adjacent a record sheet arranged within the folded portion of said central leaf and separate from said record strips.

5. A transfer pack comprising a plurality of connected leaves, certain of which are transfer leaves, one being a connecting leaf,'said leaves adapted for cooperation with record strips movable in contact therewith, said transfer leaves being connected through said connecting leaf which is folded upon itself and has the other leaves arranged in balanced relation beyond its outer faces, said folded sheet providing a loop portion for the accommodation of a. member to restrain movement of said pack, whereby the drag upon said leaves incident to frictional contact with said record strips will be apportioned substantially equally upon both sides of said folded leaf.

6. In combination a duplicating pack including a plurality of connected leaves presenting.

transfer material, one of the inner leaves remote from each of the outer faces of said pack having its body bent upon itself to provide a loop substantially parallel to each other, and one or more leaves secured to said first named leaves and providing passages between their bodies and said base leaves for the accommodation of record strips, said last named leaves being disposed adjacent both of the outer faces of said base leaves, said leaves presenting transfer material upon their faces.

8. A duplicating device including, in combination, a fiat, transversely folded base sheet, supplemental sheets superposed thereon at each side of its transverse fold line, said supplemental sheets and base sheet being attached together at points spaced apart longitudinally of said fold line to permit record strips to be interleaved with said superposed sheets, one or more of said sheets ateach side of said line having transfer material, the ends of said supplemental sheets being free between said attached points.

'9. A duplicating pack including, in combination, a transverse checking loop positioned relatively rearwardly of the pack, at least one transfer sheet positioned at each of the opposite sides of said loop and attached thereto at points spaced apart transversely of the sheets to provide. a longitudinal passageway to permit threading of record strips in superposed transfer relation with the transfer sheets.

10. A duplicating pack including, in combination, two flexible overlapping base sheets with a checking loop therebetween and having free swingable ends, at least one flexible supplemental sheet overlapped at the outer face of each of said base sheets and attached thereto at points spaced apart transversely of the sheets to permit threading of a record strip between the supplemental and base sheet between said attached points, one or more of said sheets being transfer sheets and said base sheets being integral with said loop.

11. A duplicating pack including, in combination, a checking member and a plurality of transfer sheets connected at each of the opposite sides of said checking member, there being an equal number of said transfer sheets at the opposite sides of said checking member in mutually balanced relation with reference thereto.

12. A duplicating pack including, in combination, a checking member and a plurality of transfer sheets connected at each of the opposite sides of said checking member, there being an equal number of said transfer sheets at'the opposite sides of said checking member in JOHN STUART rL MiNG. 

